untreated
adjective
un·treat·ed
ˌən-ˈtrē-təd 
: not treated
untreated wastewater
especially
: not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients
Examples of untreated in a Sentence
untreated wool
Recent Examples on the Web
The emergency overflow meant untreated water and polluted stormwater discharged directly into the river.
—
Irene Wright, USA Today, 26 May 2026
The danger is from bacterial contamination that can cause severe diarrhea, which when untreated can be life-threatening.
—Orlando Sentinel Staff, The Orlando Sentinel, 24 May 2026
If left untreated, the disease can eventually lead to narrowing and scarring of the esophagus.
—Toria Sheffield, PEOPLE, 24 May 2026
Busch’s tragic case underscores the dangers pneumonia can pose, especially when left untreated or when symptoms quickly intensify.
—Melissa Rudy, FOXNews.com, 23 May 2026
See All Example Sentences for untreated
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Irene Wright, USA Today, 26 May 2026
The danger is from bacterial contamination that can cause severe diarrhea, which when untreated can be life-threatening.
—Orlando Sentinel Staff, The Orlando Sentinel, 24 May 2026
If left untreated, the disease can eventually lead to narrowing and scarring of the esophagus.
—Toria Sheffield, PEOPLE, 24 May 2026
Busch’s tragic case underscores the dangers pneumonia can pose, especially when left untreated or when symptoms quickly intensify.
—Melissa Rudy, FOXNews.com, 23 May 2026
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 28 May. 2026.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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